【简答题】【消耗次数:1】
设 fg是合成函数,若fg是满射的,那么f是[填空1]的。
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相关题目
【简答题】 设 fg是合成函数,若fg是单射的,那么g是[填空1]的。
【简答题】 设 fg是合成函数,若fg是双射的,那么f是[填空1]而g是[填空2]的。
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